Wake-up behavior indication for power saving

ABSTRACT

Wireless communication devices, systems, and methods related to handling wake-up behavior for power saving, including during discontinuous reception (DRX) operation are provided. For example, a method of wireless communication includes transmitting, by a base station (BS) to a user equipment (UE), a default wake-up configuration associated with a discontinuous reception (DRX) operation; determining, by the BS, whether to transmit a wake-up signal (WUS) to the UE during a WUS occasion based on a traffic load; and transmitting, by the BS, a physical downlink control channel (PDCCH) signal during a duration associated with the WUS occasion.

CROSS-REFERENCE TO RELATED APPLICATIONS AND PRIORITY CLAIM

The present application is a divisional application of U.S. patentapplication Ser. No. 16/947,715, filed Aug. 13, 2020, which claimspriority to and the benefit of U.S. Provisional Patent Application No.62/888,352, filed Aug. 16, 2019, each of which is hereby incorporated byreference in its entirety as if fully set forth below and for allapplicable purposes.

TECHNICAL FIELD

This application relates to wireless communication systems, and moreparticularly to methods (and associated devices and systems) forhandling wake-up behavior for power saving, including duringdiscontinuous reception (DRX) operation.

INTRODUCTION

Wireless communications systems are widely deployed to provide varioustypes of communication content such as voice, video, packet data,messaging, broadcast, and so on. These systems may be capable ofsupporting communication with multiple users by sharing the availablesystem resources (e.g., time, frequency, and power). A wirelessmultiple-access communications system may include a number of basestations (BSs), each simultaneously supporting communications formultiple communication devices, which may be otherwise known as userequipment (UE).

Due to the power demands on wireless communication devices associatedwith voice, video, packet data, messaging, broadcast, and othercommunications, there is a desire to limit usage of device componentsand save power when possible. DRX is a technique in which a UE may entera sleep mode for a certain period of time and enter a wake-up mode foranother period of time. The sleep mode allows the UE to power downcertain radio components or at least switch certain radio components toa lower power state than an active state. Accordingly, the use of DRXcan provide power savings at the UE. Similarly, discontinuoustransmission (DTX) is a technique that may be utilized by a UE torefrain from transmitting signals in certain situations. When the UErefrains from transmitting signals using DTX, the UE can power downcertain radio components, switch certain radio components to a lowerpower state than an active state, or otherwise reduce the power demandof the UE. Similar, DRX and/or DTX techniques may be applied to a BS tosave power and/or other system resources. In addition, by refrainingfrom transmitting signals using DTX, network traffic and the potentialfor interference can be reduced. With UEs and/or BSs operating in DRXand DTX modes, there is a need to ensure the devices communicate in amanner that provides users with the expected levels of communicationlatency and throughput, while also providing power savings and prolongedbattery life.

BRIEF SUMMARY OF SOME EXAMPLES

The following summarizes some aspects of the present disclosure toprovide a basic understanding of the discussed technology. This summaryis not an extensive overview of all contemplated features of thedisclosure and is intended neither to identify key or critical elementsof all aspects of the disclosure nor to delineate the scope of any orall aspects of the disclosure. Its sole purpose is to present someconcepts of one or more aspects of the disclosure in summary form as aprelude to the more detailed description that is presented later.

Aspects of the present disclosure provide solutions for how a userequipment (UE) should perform a wake-up when a wake-up signal (WUS) isnot received from a base station (BS), while simultaneously retainingthe power savings benefits associated with discontinuous reception (DRX)and discontinuous transmission (DTX) operations. In some instances, adefault wake-up configuration is utilized by the UE when a WUS is notreceived from the BS during a WUS occasion. In this regard, the defaultwake-up configuration may cause the UE to skip PDCCH monitoring (e.g.,remain in sleep mode) during an on-duration associated with the WUSoccasion. Alternatively, the default wake-up configuration may cause theUE to actively perform PDCCH monitoring during the on-durationassociated with the WUS occasion. The default wake-up configuration canbe dynamically and/or semi-statically configured to select whether theUE should skip or actively perform PDCCH monitoring during theon-duration associated with the WUS occasion.

In an aspect of the disclosure, a method of wireless communicationincludes receiving, by a user equipment (UE) from a base station (BS), adefault wake-up configuration associated with a discontinuous reception(DRX) operation; monitoring, by the UE during a wake-up signal (WUS)occasion, for a WUS from the BS; determining, by the UE, whether the WUSwas received from the BS during the WUS occasion; and performing, by theUE, physical downlink control channel (PDCCH) monitoring based on thedefault wake-up configuration and whether the WUS was received from theBS during the WUS occasion.

In an additional aspect of the disclosure, a method of wirelesscommunication includes transmitting, by a base station (BS) to a userequipment (UE), a default wake-up configuration associated with adiscontinuous reception (DRX) operation; determining, by the BS, whetherto transmit a wake-up signal (WUS) to the UE during a WUS occasion basedon a traffic load; and transmitting, by the BS, a physical downlinkcontrol channel (PDCCH) signal during a duration associated with the WUSoccasion.

In an additional aspect of the disclosure, a user equipment (UE)includes a transceiver configured to: receive, from a base station (BS),a default wake-up configuration associated with a discontinuousreception (DRX) operation; and monitoring, during a wake-up signal (WUS)occasion, for a WUS from the BS; and a processor in communication withthe transceiver, the processor configured to: determine whether the WUSwas received from the BS during the WUS occasion; and perform physicaldownlink control channel (PDCCH) monitoring based on the default wake-upconfiguration and whether the WUS was received from the BS during theWUS occasion.

In an additional aspect of the disclosure, a base station includes atransceiver configured to: transmit, to a user equipment (UE), a defaultwake-up configuration associated with a discontinuous reception (DRX)operation and transmit a physical downlink control channel (PDCCH)signal during a duration associated with a wake-up signal (WUS)occasion; and a processor in communication with the transceiver, theprocessor configured to: determine whether to transmit a WUS to the UEduring the WUS occasion based on a traffic load.

In an additional aspect of the disclosure, a non-transitorycomputer-readable medium has program code recorded thereon, the programcode including code for causing a user equipment (UE) to receive, from abase station (BS), a default wake-up configuration associated with adiscontinuous reception (DRX) operation; code for causing the UE tomonitor, during a wake-up signal (WUS) occasion, for a WUS from the BS;code for causing the UE to determine whether the WUS was received fromthe BS during the WUS occasion; and code for causing the UE to performphysical downlink control channel (PDCCH) monitoring based on thedefault wake-up configuration and whether the WUS was received from theBS during the WUS occasion.

In an additional aspect of the disclosure, a non-transitorycomputer-readable medium has program code recorded thereon, the programcode including code for causing a base station (BS) to transmit, to auser equipment (UE), a default wake-up configuration associated with adiscontinuous reception (DRX) operation; code for causing the BS todetermine whether to transmit a wake-up signal (WUS) to the UE during aWUS occasion based on a traffic load; and code for causing the BS totransmit a physical downlink control channel (PDCCH) signal during aduration associated with the WUS occasion.

Other aspects, features, and advantages of the present invention willbecome apparent to those of ordinary skill in the art, upon reviewingthe following description of specific, exemplary embodiments of thepresent invention in conjunction with the accompanying figures. Whilefeatures of the present invention may be discussed relative to certainexamples and figures below, all embodiments of the present invention caninclude one or more of the advantageous features discussed herein. Inother words, while one or more embodiments may be discussed as havingcertain advantageous features, one or more of such features may also beused in accordance with the various other embodiments of the inventiondiscussed herein. In similar fashion, while exemplary embodiments may bediscussed below as device, system, or method embodiments, it should beunderstood that such exemplary embodiments can be implemented in variousdevices, systems, and methods.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 illustrates a wireless communication network according to someaspects of the present disclosure.

FIG. 2 illustrates a scheduling/transmission configuration of a wirelesscommunication method according to some aspects of the presentdisclosure.

FIG. 3 illustrates a message structure of a wireless communicationmethod according to some aspects of the present disclosure.

FIG. 4 is a block diagram of a user equipment (UE) according to someaspects of the present disclosure.

FIG. 5 is a block diagram of an exemplary base station (BS) according toaspects of the present disclosure.

FIG. 6 illustrates a scheduling/transmission configuration of a wirelesscommunication method according to some aspects of the presentdisclosure.

FIG. 7A illustrates a scheduling/transmission configuration of awireless communication method according to some aspects of the presentdisclosure.

FIG. 7B illustrates a scheduling/transmission configuration of awireless communication method according to some aspects of the presentdisclosure.

FIG. 8A illustrates a protocol diagram of a wireless communicationmethod according to some aspects of the present disclosure.

FIG. 8B illustrates a protocol diagram of a wireless communicationmethod according to some aspects of the present disclosure.

FIG. 9 illustrates a protocol diagram of a wireless communication methodaccording to some aspects of the present disclosure.

FIG. 10 illustrates a protocol diagram of a wireless communicationmethod according to some aspects of the present disclosure.

FIG. 11 illustrates a protocol diagram of a wireless communicationmethod according to some aspects of the present disclosure.

FIG. 12 illustrates a flow diagram of a wireless communication methodaccording to some aspects of the present disclosure.

FIG. 13 illustrates a flow diagram of a wireless communication methodaccording to some aspects of the present disclosure.

DETAILED DESCRIPTION

The detailed description set forth below, in connection with theappended drawings, is intended as a description of variousconfigurations and is not intended to represent the only configurationsin which the concepts described herein may be practiced. The detaileddescription includes specific details for the purpose of providing athorough understanding of the various concepts. However, it will beapparent to those skilled in the art that these concepts may bepracticed without these specific details. In some instances, well-knownstructures and components are shown in block diagram form in order toavoid obscuring such concepts.

This disclosure relates generally to wireless communications systems,also referred to as wireless communications networks. In variousembodiments, the techniques and apparatus may be used for wirelesscommunication networks such as code division multiple access (CDMA)networks, time division multiple access (TDMA) networks, frequencydivision multiple access (FDMA) networks, orthogonal FDMA (OFDMA)networks, single-carrier FDMA (SC-FDMA) networks, LTE networks, GlobalSystem for Mobile Communications (GSM) networks, 5^(th) Generation (5G)or new radio (NR) networks, as well as other communications networks. Asdescribed herein, the terms “networks” and “systems” may be usedinterchangeably.

An OFDMA network may implement a radio technology such as evolved UTRA(E-UTRA), Institute of Electrical and Electronics Engineers (IEEE)802.11, IEEE 802.16, IEEE 802.20, flash-OFDM and the like. UTRA, E-UTRA,and GSM are part of universal mobile telecommunication system (UMTS). Inparticular, long term evolution (LTE) is a release of UMTS that usesE-UTRA. UTRA, E-UTRA, GSM, UMTS and LTE are described in documentsprovided from an organization named “3rd Generation Partnership Project”(3GPP), and cdma2000 is described in documents from an organizationnamed “3rd Generation Partnership Project 2” (3GPP2). These variousradio technologies and standards are known or are being developed. Forexample, the 3rd Generation Partnership Project (3GPP) is acollaboration between groups of telecommunications associations thataims to define a globally applicable third generation (3G) mobile phonespecification. 3GPP long term evolution (LTE) is a 3GPP project whichwas aimed at improving the UMTS mobile phone standard. The 3GPP maydefine specifications for the next generation of mobile networks, mobilesystems, and mobile devices. The present disclosure is concerned withthe evolution of wireless technologies from LTE, 4G, 5G, NR, and beyondwith shared access to wireless spectrum between networks using acollection of new and different radio access technologies or radio airinterfaces.

In particular, 5G networks contemplate diverse deployments, diversespectrum, and diverse services and devices that may be implemented usingan OFDM-based unified, air interface. In order to achieve these goals,further enhancements to LTE and LTE-A are considered in addition todevelopment of the new radio technology for 5G NR networks. The 5G NRwill be capable of scaling to provide coverage (1) to a massive Internetof things (IoTs) with a ULtra-high density (e.g., ˜1M nodes/km²),ultra-low complexity (e.g., ˜10s of bits/sec), ultra-low energy (e.g.,˜10+ years of battery life), and deep coverage with the capability toreach challenging locations; (2) including mission-critical control withstrong security to safeguard sensitive personal, financial, orclassified information, ultra-high reliability (e.g., —99.9999%reliability), ultra-low latency (e.g., ˜1 ms), and users with wideranges of mobility or lack thereof; and (3) with enhanced mobilebroadband including extreme high capacity (e.g., ˜10 Tbps/km²), extremedata rates (e.g., multi-Gbps rate, 100+ Mbps user experienced rates),and deep awareness with advanced discovery and optimizations.

The 5G NR may be implemented to use optimized OFDM-based waveforms withscalable numerology and transmission time interval (TTI); having acommon, flexible framework to efficiently multiplex services andfeatures with a dynamic, low-latency time division duplex(TDD)/frequency division duplex (FDD) design; and with advanced wirelesstechnologies, such as massive multiple input, multiple output (MIMO),robust millimeter wave (mmWave) transmissions, advanced channel coding,and device-centric mobility. Scalability of the numerology in 5G NR,with scaling of subcarrier spacing, may efficiently address operatingdiverse services across diverse spectrum and diverse deployments. Forexample, in various outdoor and macro coverage deployments of less than3 GHz FDD/TDD implementations, subcarrier spacing may occur with 15 kHz,for example over 5, 10, 20 MHz, and the like bandwidth (BW). For othervarious outdoor and small cell coverage deployments of TDD greater than3 GHz, subcarrier spacing may occur with 30 kHz over 80/100 MHz BW. Forother various indoor wideband implementations, using a TDD over theunlicensed portion of the 5 GHz band, the subcarrier spacing may occurwith 60 kHz over a 160 MHz BW. Finally, for various deploymentstransmitting with mmWave components at a TDD of 28 GHz, subcarrierspacing may occur with 120 kHz over a 500 MHz BW.

The scalable numerology of the 5G NR facilitates scalable TTI fordiverse latency and quality of service (QoS) requirements. For example,shorter TTI may be used for low latency and high reliability, whilelonger TTI may be used for higher spectral efficiency. The efficientmultiplexing of long and short TTIs to allow transmissions to start onsymbol boundaries. 5G NR also contemplates a self-contained integratedsubframe design with uplink/downlink scheduling information, data, andacknowledgement in the same subframe. The self-contained integratedsubframe supports communications in unlicensed or contention-basedshared spectrum, adaptive uplink/downlink that may be flexiblyconfigured on a per-cell basis to dynamically switch between uplink anddownlink to meet the current traffic needs.

Various other aspects and features of the disclosure are furtherdescribed below. It should be apparent that the teachings herein may beembodied in a wide variety of forms and that any specific structure,function, or both being disclosed herein is merely representative andnot limiting. Based on the teachings herein one of an ordinary level ofskill in the art should appreciate that an aspect disclosed herein maybe implemented independently of any other aspects and that two or moreof these aspects may be combined in various ways. For example, anapparatus may be implemented or a method may be practiced using anynumber of the aspects set forth herein. In addition, such an apparatusmay be implemented or such a method may be practiced using otherstructure, functionality, or structure and functionality in addition toor other than one or more of the aspects set forth herein. For example,a method may be implemented as part of a system, device, apparatus,and/or as instructions stored on a computer readable medium forexecution on a processor or computer. Furthermore, an aspect maycomprise at least one element of a claim.

In a wireless communication network, DRX is a technique in which a UEmay enter a sleep mode for a certain period of time and enter a wake-upmode for another period of time. During the wake-up period, the UE maymonitor for PDCCH from a serving BS and decode PDCCH received from theBS. During the sleep period, the UE may not monitor for PDCCH. The sleepmode allows the UE to power down certain radio components or at leastswitch certain radio components to a lower power state than an activestate. Accordingly, the use of DRX can provide power savings at the UE.Similarly, discontinuous transmission (DTX) is a technique that may beutilized by a BS to refrain from transmitting signals in certainsituations. When the BS refrains from transmitting signals using DTX,the BS can power down certain radio components, switch certain radiocomponents to a lower power state than an active state, or otherwisereduce the power demand of the BS. In addition, by refraining fromtransmitting signals using DTX, network traffic and the potential forinterference can be reduced.

The present disclosure provides methods, systems, and devices thatdictate how a user equipment (UE) should perform a wake-up when awake-up signal (WUS) is not received from a base station (BS), whilesimultaneously retaining the power savings benefits associated with DRXand DTX operations. In some instances, a default wake-up configurationis utilized by the UE when a WUS is not received from the BS during aWUS occasion. In this regard, the default wake-up configuration maycause the UE to skip PDCCH monitoring (e.g., remain in sleep mode)during an on-duration associated with the WUS occasion. Alternatively,the default wake-up configuration may cause the UE to actively performPDCCH monitoring during the on-duration associated with the WUSoccasion. The default wake-up configuration can be dynamically and/orsemi-statically configured to select whether the UE should skip oractively perform PDCCH monitoring during the on-duration associated withthe WUS occasion.

These and other aspects of the present disclosure can provide severalbenefits. For example, the amount of time a UE can spend in a sleep modeas part of a DRX operation, including a connected mode DRX (C-DRX), canbe increased, reducing power consumption and increasing battery life. Inthis regard, having the UE remain in a sleep state instead ofunnecessarily monitoring for PDCCH facilitates the UE powering down oroff one or more components of the UE associated with receiving,decoding, and/or otherwise processing PDCCH signals. Similarly, theamount of time a BS can refrain from transmitting signals as part of aDTX operation can be increased, reducing the power consumption of theBS, reducing network traffic, saving system resources, and reducing thepotential for interference. Additional features and benefits of thepresent disclosure are set forth in the following description.

FIG. 1 illustrates a wireless communication network 100 according tosome embodiments of the present disclosure. The network 100 may be a 5Gnetwork. The network 100 includes a number of base stations (BSs) 105(individually labeled as 105 a, 105 b, 105 c, 105 d, 105 e, and 105 f)and other network entities. ABS 105 may be a station that communicateswith UEs 115 and may also be referred to as an evolved node B (eNB), anext generation eNB (gNB), an access point, and the like. Each BS 105may provide communication coverage for a particular geographic area. In3GPP, the term “cell” can refer to this particular geographic coveragearea of a BS 105 and/or a BS subsystem serving the coverage area,depending on the context in which the term is used.

ABS 105 may provide communication coverage for a macro cell or a smallcell, such as a pico cell or a femto cell, and/or other types of cell. Amacro cell generally covers a relatively large geographic area (e.g.,several kilometers in radius) and may allow unrestricted access by UEswith service subscriptions with the network provider. A small cell, suchas a pico cell, would generally cover a relatively smaller geographicarea and may allow unrestricted access by UEs with service subscriptionswith the network provider. A small cell, such as a femto cell, wouldalso generally cover a relatively small geographic area (e.g., a home)and, in addition to unrestricted access, may also provide restrictedaccess by UEs having an association with the femto cell (e.g., UEs in aclosed subscriber group (CSG), UEs for users in the home, and the like).A BS for a macro cell may be referred to as a macro BS. A BS for a smallcell may be referred to as a small cell BS, a pico BS, a femto BS or ahome BS. In the example shown in FIG. 1 , the BSs 105 d and 105 e may beregular macro BSs, while the BSs 105 a-105 c may be macro BSs enabledwith one of three dimension (3D), full dimension (FD), or massive MIMO.The BSs 105 a-105 c may take advantage of their higher dimension MIMOcapabilities to exploit 3D beamforming in both elevation and azimuthbeamforming to increase coverage and capacity. The BS 105 f may be asmall cell BS which may be a home node or portable access point. A BS105 may support one or multiple (e.g., two, three, four, and the like)cells.

The network 100 may support synchronous or asynchronous operation. Forsynchronous operation, the BSs may have similar frame timing, andtransmissions from different BSs may be approximately aligned in time.For asynchronous operation, the BSs may have different frame timing, andtransmissions from different BSs may not be aligned in time.

The UEs 115 are dispersed throughout the wireless network 100, and eachUE 115 may be stationary or mobile. A UE 115 may also be referred to asa terminal, a mobile station, a subscriber unit, a station, or the like.A UE 115 may be a cellular phone, a personal digital assistant (PDA), awireless modem, a wireless communication device, a handheld device, atablet computer, a laptop computer, a cordless phone, a wireless localloop (WLL) station, or the like. In one aspect, a UE 115 may be a devicethat includes a Universal Integrated Circuit Card (UICC). In anotheraspect, a UE may be a device that does not include a UICC. In someaspects, the UEs 115 that do not include UICCs may also be referred toas IoT devices or internet of everything (IoE) devices. The UEs 115a-115 d are examples of mobile smart phone-type devices accessingnetwork 100. A UE 115 may also be a machine specifically configured forconnected communication, including machine type communication (MTC),enhanced MTC (eMTC), narrowband IoT (NB-IoT) and the like. The UEs 115e-115 k are examples of various machines configured for communicationthat access the network 100. A UE 115 may be able to communicate withany type of the BSs, whether macro BS, small cell, or the like. In FIG.1 , a lightning bolt (e.g., communication links) indicates wirelesstransmissions between a UE 115 and a serving BS 105, which is a BSdesignated to serve the UE 115 on the downlink and/or uplink, or desiredtransmission between BSs, and backhaul transmissions between BSs.

In operation, the BSs 105 a-105 c may serve the UEs 115 a and 115 busing 3D beamforming and coordinated spatial techniques, such ascoordinated multipoint (CoMP) or multi-connectivity. The macro BS 105 dmay perform backhaul communications with the BSs 105 a-105 c, as well assmall cell, the BS 105 f. The macro BS 105 d may also transmitsmulticast services which are subscribed to and received by the UEs 115 cand 115 d. Such multicast services may include mobile television orstream video, or may include other services for providing communityinformation, such as weather emergencies or alerts, such as Amber alertsor gray alerts.

The BSs 105 may also communicate with a core network. The core networkmay provide user authentication, access authorization, tracking,Internet Protocol (IP) connectivity, and other access, routing, ormobility functions. At least some of the BSs 105 (e.g., which may be anexample of a gNB or an access node controller (ANC)) may interface withthe core network through backhaul links (e.g., NG-C, NG-U, etc.) and mayperform radio configuration and scheduling for communication with theUEs 115. In various examples, the BSs 105 may communicate, eitherdirectly or indirectly (e.g., through core network), with each otherover backhaul links (e.g., X1, X2, etc.), which may be wired or wirelesscommunication links.

The network 100 may also support mission critical communications withultra-reliable and redundant links for mission critical devices, such asthe UE 115 e, which may be a drone. Redundant communication links withthe UE 115 e may include links from the macro BSs 105 d and 105 e, aswell as links from the small cell BS 105 f. Other machine type devices,such as the UE 115 f (e.g., a thermometer), the UE 115 g (e.g., smartmeter), and UE 115 h (e.g., wearable device) may communicate through thenetwork 100 either directly with BSs, such as the small cell BS 105 f,and the macro BS 105 e, or in multi-hop configurations by communicatingwith another user device which relays its information to the network,such as the UE 115 f communicating temperature measurement informationto the smart meter, the UE 115 g, which is then reported to the networkthrough the small cell BS 105 f. The network 100 may also provideadditional network efficiency through dynamic, low-latency TDD/FDDcommunications, such as in a vehicle-to-vehicle (V2V).

In some implementations, the network 100 utilizes OFDM-based waveformsfor communications. An OFDM-based system may partition the system BWinto multiple (K) orthogonal subcarriers, which are also commonlyreferred to as subcarriers, tones, bins, or the like. Each subcarriermay be modulated with data. In some instances, the subcarrier spacingbetween adjacent subcarriers may be fixed, and the total number ofsubcarriers (K) may be dependent on the system BW. The system BW mayalso be partitioned into subbands. In other instances, the subcarrierspacing and/or the duration of TTIs may be scalable.

In an embodiment, the BSs 105 can assign or schedule transmissionresources (e.g., in the form of time-frequency resource blocks (RB)) fordownlink (DL) and uplink (UL) transmissions in the network 100. DLrefers to the transmission direction from a BS 105 to a UE 115, whereasUL refers to the transmission direction from a UE 115 to a BS 105. Thecommunication can be in the form of radio frames. A radio frame may bedivided into a plurality of subframes or slots, for example, about 10.Each slot may be further divided into mini-slots. In a FDD mode,simultaneous UL and DL transmissions may occur in different frequencybands. For example, each subframe includes a UL subframe in a ULfrequency band and a DL subframe in a DL frequency band. In a TDD mode,UL and DL transmissions occur at different time periods using the samefrequency band. For example, a subset of the subframes (e.g., DLsubframes) in a radio frame may be used for DL transmissions and anothersubset of the subframes (e.g., UL subframes) in the radio frame may beused for UL transmissions.

The DL subframes and the UL subframes can be further divided intoseveral regions. For example, each DL or UL subframe may havepre-defined regions for transmissions of reference signals, controlinformation, and data. Reference signals are predetermined signals thatfacilitate the communications between the BSs 105 and the UEs 115. Forexample, a reference signal can have a particular pilot pattern orstructure, where pilot tones may span across an operational BW orfrequency band, each positioned at a pre-defined time and a pre-definedfrequency. For example, a BS 105 may transmit cell specific referencesignals (CRSs) and/or channel state information-reference signals(CSI-RSs) to enable a UE 115 to estimate a DL channel. Similarly, a UE115 may transmit sounding reference signals (SRSs) to enable a BS 105 toestimate a UL channel. Control information may include resourceassignments and protocol controls. Data may include protocol data and/oroperational data. In some embodiments, the BSs 105 and the UEs 115 maycommunicate using self-contained subframes. A self-contained subframemay include a portion for DL communication and a portion for ULcommunication. A self-contained subframe can be DL-centric orUL-centric. A DL-centric subframe may include a longer duration for DLcommunication than for UL communication. A UL-centric subframe mayinclude a longer duration for UL communication than for ULcommunication.

In an embodiment, the network 100 may be an NR network deployed over alicensed spectrum. The BSs 105 can transmit synchronization signals(e.g., including a primary synchronization signal (PSS) and a secondarysynchronization signal (SSS)) in the network 100 to facilitatesynchronization. The BSs 105 can broadcast system information associatedwith the network 100 (e.g., including a master information block (MIB),remaining system information (RMSI), and other system information (OSI))to facilitate initial network access. In some instances, the BSs 105 maybroadcast the PSS, the SSS, and/or the MIB in the form ofsynchronization signal block (SSBs) over a physical broadcast channel(PBCH) and may broadcast the RMSI and/or the OSI over a physicaldownlink shared channel (PDSCH).

In an embodiment, a UE 115 attempting to access the network 100 mayperform an initial cell search by detecting a PSS from a BS 105. The PSSmay enable synchronization of period timing and may indicate a physicallayer identity value. The UE 115 may then receive a SSS. The SSS mayenable radio frame synchronization, and may provide a cell identityvalue, which may be combined with the physical layer identity value toidentify the cell. The PSS and the SSS may be located in a centralportion of a carrier or any suitable frequencies within the carrier.

After receiving the PSS and SSS, the UE 115 may receive a MIB. The MIBmay include system information for initial network access and schedulinginformation for RMSI and/or OSI. After decoding the MIB, the UE 115 mayreceive RMSI and/or OSI. The RMSI and/or OSI may include radio resourcecontrol (RRC) information related to random access channel (RACH)procedures, paging, control resource set (CORESET) for physical downlinkcontrol channel (PDCCH) monitoring, physical uplink control channel(PUCCH), physical uplink shared channel (PUSCH), power control, and SRS.

After obtaining the MIB, the RMSI and/or the OSI, the UE 115 can performa random access procedure to establish a connection with the BS 105. Insome examples, the random access procedure may be a four-step randomaccess procedure. For example, the UE 115 may transmit a random accesspreamble and the BS 105 may respond with a random access response. Therandom access response (RAR) may include a detected random accesspreamble identifier (ID) corresponding to the random access preamble,timing advance (TA) information, a UL grant, a temporary cell-radionetwork temporary identifier (C-RNTI), and/or a backoff indicator. Uponreceiving the random access response, the UE 115 may transmit aconnection request to the BS 105 and the BS 105 may respond with aconnection response. The connection response may indicate a contentionresolution. In some examples, the random access preamble, the RAR, theconnection request, and the connection response can be referred to as amessage 1 (MSG 1), a message 2 (MSG 2), a message 3 (MSG 3), and amessage 4 (MSG 4), respectively. In some examples, the random accessprocedure may be a two-step random access procedure, where the UE 115may transmit a random access preamble and a connection request in asingle transmission and the BS 105 may respond by transmitting a randomaccess response and a connection response in a single transmission. Thecombined random access preamble and connection request in the two-steprandom access procedure may be referred to as a message A (MSG A). Thecombined random access response and connection response in the two-steprandom access procedure may be referred to as a message B (MSG B).

After establishing a connection, the UE 115 may initiate an initialnetwork attachment procedure with the network 100. When the UE 115 hasno active data communication with the BS 105 after the networkattachment, the UE 115 may return to an idle state (e.g., RRC idlemode). Alternatively, the UE 115 and the BS 105 can enter an operationalstate or active state, where operational data may be exchanged (e.g.,RRC connected mode). For example, the BS 105 may schedule the UE 115 forUL and/or DL communications. The BS 105 may transmit UL and/or DLscheduling grants to the UE 115 via a PDCCH. The BS 105 may transmit aDL communication signal to the UE 115 via a PDSCH according to a DLscheduling grant. The UE 115 may transmit a UL communication signal tothe BS 105 via a PUSCH and/or PUCCH according to a UL scheduling grant.In some embodiments, the BS 105 and the UE 115 may employ hybridautomatic request (HARD) techniques for communications to improvereliability. Additionally, the UE 115 and/or the BS 105 can utilize DRX(e.g., during RRC idle mode), including connected mode DRX (C-DRX)(e.g., during RRC connected mode), and/or DTX operating modes asdiscussed in greater detail below.

In an embodiment, the network 100 may operate over a system BW or acomponent carrier (CC) BW. The network 100 may partition the system BWinto multiple BWPs (e.g., portions). ABS 105 may dynamically assign a UE115 to operate over a certain BWP (e.g., a certain portion of the systemBW). The assigned BWP may be referred to as the active BWP. The UE 115may monitor the active BWP for signaling information from the BS 105.The BS 105 may schedule the UE 115 for UL or DL communications in theactive BWP. In some instances, a BS 105 may assign a pair of BWPs withinthe CC to a UE 115 for UL and DL communications. For example, the BWPpair may include one BWP for UL communications and one BWP for DLcommunications. In some instances, the BS 105 may dynamically switch theUE 115 from one BWP to another BWP, for example, from a wideband BWP toa narrowband BWP for power savings or from a narrowband BWP to awideband BWP for communication.

The BS 105 may additionally configure the UE 115 with one or moreCORESETs in a BWP. A CORESET may include a set of frequency resourcesspanning a number of symbols in time. The BS 105 may configure the UE115 with one or more search spaces for PDCCH monitoring based on theCORESETS. The UE 115 may perform blind decoding in the search spaces tosearch for DL control information from the BS. The BS 105 may configurethe UE 115 with various different CORSETs and/or search spaces fordifferent types of PDCCH monitoring (e.g., DL/UL schedules and/orwake-up information). In an example, the BS 105 may configure the UE 115with the BWPs, the CORESETS, and/or the PDCCH search spaces via RRCconfigurations.

In an embodiment, the BS 105 may establish a RRC connection with the UE115 in a primary cell (PCell) (e.g., over a primary frequency carrier)and may subsequently configure the UE 115 to communicate over asecondary cell (SCell) (e.g., over a secondary frequency carrier). In anembodiment, the BS 105 may trigger the UE 115 to report channelinformation based on channel-state-information-reference signal (CSI-RS)transmitted by the BS 105. In some instances, the triggering may beaperiodic, which may be referred to as aperiodic-CSI-RS (A-CSI-RS)triggering.

The network 100 may operate over a shared frequency band or anunlicensed frequency band, for example, at about 3.5 gigahertz (GHz),sub-6 GHz or higher frequencies in the mmWave band. The network 100 maypartition a frequency band into multiple channels, for example, eachoccupying about 20 megahertz (MHz). The BSs 105 and the UEs 115 may beoperated by multiple network operating entities sharing resources in theshared communication medium and may acquire channel occupancy time (COT)in the share medium for communications. A COT may be non-continuous intime and may refer to an amount of time a wireless node can send frameswhen it has won contention for the wireless medium. Each COT may includea plurality of transmission slots. A COT may also be referred to as atransmission opportunity (TXOP).

FIG. 2 illustrates a scheduling/transmission configuration 200 of awireless communication method according to some aspects of the presentdisclosure. As shown, FIG. 2 shows a UE operating in a DRX mode and/orC-DRX mode in accordance with the present disclosure. The DRX modeand/or the C-DRX mode may have a certain duty cycle with anactive/on-period or an inactive/sleep-period. At 210, the UE is in asleep state. At wake-up signal (WUS) occasion 220, a WUS 222 istransmitted by a BS. The UE can monitor for the WUS 222 during WUSoccasion 220. Search space sets can be configured that define the WUSmonitoring occasions, including WUS occasion 220. The search space setscan be dedicated as a wake-up search space set. In some instances, awake-up search space set is dedicated to a particular group of UEs(e.g., based on BWP, carrier, geographical location, priority, service,subscription, etc.). In other instances, a wake-up search space isshared across multiple groups of UEs. In some instances, the UE monitorsfor the WUS based on a WUS configuration received from the networkand/or the BS. In this regard, the WUS configuration can indicate to theUE resources (e.g., search space including time and frequency resources,periodicity, channel, BWP, frequency carrier, etc.) associated with aWUS occasion, WUS format, etc.

The WUS occasion 220 is followed by an offset 230, during which the UEcan return to a sleep state. The offset 230 spaces the WUS occasion 220from an on-duration 240. The on-duration 240 is associated with the WUSoccasion 220. In the illustrated example, a single on-duration 240 isshown. However, it is understood that multiple on-durations (e.g., 2, 3,4, 5, 6, etc.) may be associated with a WUS occasion. During theon-duration 240, the UE is an active state and may monitor PDCCH orother signals from the BS and/or transmit UL data to the BS, asindicated by UL/DL communication block 242. In this regard, in someinstances the UE performs PDCCH monitoring during the on-duration 240based on information received in the WUS 222. For example, the WUS 222may instruct the UE to execute one or more of an aperiodic channel statereference signal (A-CSI-RS) triggering, a PDCCH monitoring reduction, abandwidth part (BWP) switch, or a secondary cell (Scell) wake-up.

As shown in FIG. 2 , this same process repeats with the UE in a sleepstate 250, followed by another WUS occasion 260 where a WUS 262 istransmitted. Offset 270 spaces the WUS occasion 260 from an associatedon-duration 280 where DL/UL communications 282 occur.

FIG. 3 illustrates a message structure 300 according to some aspects ofthe present disclosure. The message structure 300 can be used for WUS222 or 262 of FIG. 2 in some instances. In this regard, the messagestructure 300 is suitable to provide wake-up downlink controlinformation (DCI) to a UE, or group of UEs. In this regard, the wake-upDCI may be provided on a per-UE basis or a per UE-group basis. In someinstances, UEs are grouped based on BWP, carrier, geographical location,priority, service, subscription, and/or other factors. In someinstances, the wake-up DCI is sent with cyclic redundancy check (CRC)scrambled by an identifier associated with the UE (e.g., C-RNTI) or thegroup of UEs (e.g., power saving radio network temporary identifier(PS-RNTI). In this regard, UEs in the same group may be configured witha common identifier (e.g., PS-RNTI) and utilize the same search spaceset for the wake-up DCI.

As shown in FIG. 3 , the message structure 300 includes a wake-upindicator and wake-up field information for each UE or group of UEs.More specifically, in the illustrated example, the message structure isshown with a wake-up indicator 310 and wake-up field information 312 forUE1, a wake-up indicator 320 and wake-up field information 322 for UE2,and a wake-up indicator 330 and wake-up field information 332 for UE3.In this regard, the wake-up indicators 310, 320, 330 can indicate to theassociated UE or group of UEs whether to remain in a sleep state orenter an active state during one or more on-durations associated withthe WUS occasion in which the wake-up DCI is transmitted. For example, avalue of 1 in the wake-up indicator field can indicate for the UE towake up and monitor during the next on-duration, whereas a value of 0 inthe wake-up indicator field can indicate the UE should skip the nexton-duration and remain in sleep state. The wake-up field information312, 322, 332 can indicate to the associated UE or group of UEs detailsas to how the UE should perform the PDCCH monitoring during theassociated on-duration(s) if the UE is to enter an active state (e.g.,when the wake-up indicator is a 1). For example, the wake-up fieldinformation 312, 322, 332 may instruct the UE to execute one or more ofan aperiodic channel state reference signal (A-CSI-RS) triggering, aPDCCH monitoring reduction, a bandwidth part (BWP) switch, or asecondary cell (Scell) wake-up. Additionally, the wake-up fieldinformation 312, 322, 332 may include PDCCH monitoring parameters, suchas PDCCH monitoring duration, PDCCH monitoring periodicity, number ofcandidates for PDCCH blind decoding, for PDCCH monitoring during awake-up on-duration associated with a corresponding WUS. While themessage structure depicted in FIG. 3 interleaves the wake-up indicators310, 320, 330 with the wake-up information fields 312, 322, 332 intopairs based on UE (or UE group), it is understood that any suitablemessage structure or arrangement may be utilized, including have all ofthe wake-up indicators 310, 320, 330 prior to all wake-up informationfields 312, 322, 332, including all wake-up information fields 312, 322,332 prior to all wake-up indicators 310, 320, 330, interleaving thewake-up indicators 310, 320, 330 and wake-up information fields 312,322, 332 leading with the wake-up information fields, etc.

Each of the wake-up indicators 310, 320, 330 and wake-up informationfields 312, 322, 332 may have any suitable bit-length. In someinstances, each of the wake-up indicators 310, 320, 330 may have abit-length of 1. When the network traffic is light or sparse, thewake-up indicators 310, 320, 330 may be have a bit-values of 0 most ofthe time. Conversely, when the network traffic is heavy or dense, thewake-up indicators 310, 320, 330 may have bit-values of ones most of thetime.

FIG. 4 is a block diagram of an exemplary UE 400 according to aspects ofthe present disclosure. The UE 400 may be a UE 115 as discussed above inFIG. 1 . As shown, the UE 400 may include a processor 402, a memory 404,a WUS processing and control module 408, a transceiver 410 including amodem subsystem 412 and a radio frequency (RF) unit 414, and one or moreantennas 416. These elements may be in direct or indirect communicationwith each other, for example via one or more buses.

The processor 402 may include a central processing unit (CPU), a digitalsignal processor (DSP), an application specific integrated circuit(ASIC), a controller, a field programmable gate array (FPGA) device,another hardware device, a firmware device, or any combination thereofconfigured to perform the operations described herein. The processor 402may also be implemented as a combination of computing devices, e.g., acombination of a DSP and a microprocessor, a plurality ofmicroprocessors, one or more microprocessors in conjunction with a DSPcore, or any other such configuration.

The memory 404 may include a cache memory (e.g., a cache memory of theprocessor 402), random access memory (RAM), magnetoresistive RAM (MRAM),read-only memory (ROM), programmable read-only memory (PROM), erasableprogrammable read only memory (EPROM), electrically erasableprogrammable read only memory (EEPROM), flash memory, solid state memorydevice, hard disk drives, other forms of volatile and non-volatilememory, or a combination of different types of memory. In an embodiment,the memory 404 includes a non-transitory computer-readable medium. Thememory 404 may store, or have recorded thereon, instructions 406. Theinstructions 406 may include instructions that, when executed by theprocessor 402, cause the processor 402 to perform the operationsdescribed herein with reference to the UEs 115 in connection withaspects of the present disclosure, for example, aspects of FIGS. 2, 3,6-12 . Instructions 406 may also be referred to as program code. Theprogram code may be for causing a wireless communication device (orspecific component(s) of the wireless communication device) to performthese operations, for example by causing one or more processors (such asprocessor 402) to control or command the wireless communication device(or specific component(s) of the wireless communication device) to doso. The terms “instructions” and “code” should be interpreted broadly toinclude any type of computer-readable statement(s). For example, theterms “instructions” and “code” may refer to one or more programs,routines, sub-routines, functions, procedures, etc. “Instructions” and“code” may include a single computer-readable statement or manycomputer-readable statements.

The WUS processing and control module 408 may be implemented viahardware, software, or combinations thereof. For example, WUS processingand control module 408 may be implemented as a processor, circuit,and/or instructions 406 stored in the memory 404 and executed by theprocessor 402. In some examples, the WUS processing and control module408 can be integrated within the modem subsystem 412. For example, theWUS processing and control module 408 can be implemented by acombination of software components (e.g., executed by a DSP or a generalprocessor) and hardware components (e.g., logic gates and circuitry)within the modem subsystem 412.

The WUS processing and control module 408 may be used for variousaspects of the present disclosure, for example, aspects of FIGS. 2, 3,and 6-12 . The WUS processing and control module 408 is configured tocommunicate with other components of the UE 400 to receive a defaultwake-up configuration associated with a discontinuous reception (DRX)operation (e.g., for idle mode or connected mode), monitor for a WUSfrom the BS during a wake-up signal (WUS) occasion, determine whetherthe WUS was received from the BS during the WUS occasion, perform PDCCHmonitoring; receive a WUS (including a WUS configuration) during a WUSoccasion; operate using one or more wake-up configurations, start atimer, determine whether a timer has expired, cancel a timer, determinewhether a condition has occurred or is met, and/or perform otherfunctionalities related to the wake-up procedures of a UE described inthe present disclosure.

As shown, the transceiver 410 may include the modem subsystem 412 andthe RF unit 414. The transceiver 410 can be configured to communicatebi-directionally with other devices, such as the BSs 105. The modemsubsystem 412 may be configured to modulate and/or encode the data fromthe memory 404, and/or the WUS processing and control module 408according to a modulation and coding scheme (MCS) (e.g., a low-densityparity check (LDPC) coding scheme, a turbo coding scheme, aconvolutional coding scheme, a digital beamforming scheme, etc.). The RFunit 414 may be configured to process (e.g., perform analog to digitalconversion or digital to analog conversion, etc.) modulated/encoded data(e.g., UL control information, UL data) from the modem subsystem 412 (onoutbound transmissions) or of transmissions originating from anothersource such as a UE 115 or a BS 105. The RF unit 414 may be furtherconfigured to perform analog beamforming in conjunction with the digitalbeamforming. Although shown as integrated together in transceiver 410,the modem subsystem 412 and the RF unit 414 may be separate devices thatare coupled together at the UE 115 to enable the UE 115 to communicatewith other devices.

The RF unit 414 may provide the modulated and/or processed data (e.g.,data packets or, more generally, data messages that may contain one ormore data packets and other information) to the antennas 416 fortransmission to one or more other devices. The antennas 416 may furtherreceive data messages transmitted from other devices. The antennas 416may provide the received data messages for processing and/ordemodulation at the transceiver 410. The transceiver 410 may provide thedemodulated and decoded data (e.g., default wake-up configurations,WUSs, PDCCH signals, radio resource control (RRC) signals, media accesscontrol (MAC) control element (CE) signals, DL/UL scheduling grants, DLdata, etc.) to the WUS processing and control module 408 for processing.The antennas 416 may include multiple antennas of similar or differentdesigns in order to sustain multiple transmission links. The RF unit 414may configure the antennas 416. The RF unit 414 and/or the transceiver410 may include components and/or circuitries that can be powers onand/or off dynamically for power savings. Additionally, oralternatively, the RF unit 414 and/or the transceiver 410 may includecomponents and/or circuitries with multiple power states that can beconfigured to transition from one power state (e.g., a higher-powerstate) to another power state (e.g., a lower-power state) for powersavings.

In an embodiment, the UE 400 can include multiple transceivers 410implementing different RATs (e.g., NR and LTE). In an embodiment, the UE400 can include a single transceiver 410 implementing multiple RATs(e.g., NR and LTE). In an embodiment, the transceiver 410 can includevarious components, where different combinations of components canimplement different RATs.

FIG. 5 is a block diagram of an exemplary BS 500 according to aspects ofthe present disclosure. The BS 500 may be a BS 105 as discussed above inFIG. 1 . As shown, the BS 500 may include a processor 502, a memory 504,a WUS processing and control module 508, a transceiver 510 including amodem subsystem 512 and a RF unit 514, and one or more antennas 516.These elements may be in direct or indirect communication with eachother, for example via one or more buses.

The processor 502 may have various features as a specific-typeprocessor. For example, these may include a CPU, a DSP, an ASIC, acontroller, a FPGA device, another hardware device, a firmware device,or any combination thereof configured to perform the operationsdescribed herein. The processor 502 may also be implemented as acombination of computing devices, e.g., a combination of a DSP and amicroprocessor, a plurality of microprocessors, one or moremicroprocessors in conjunction with a DSP core, or any other suchconfiguration.

The memory 504 may include a cache memory (e.g., a cache memory of theprocessor 502), RAM, MRAM, ROM, PROM, EPROM, EEPROM, flash memory, asolid state memory device, one or more hard disk drives, memristor-basedarrays, other forms of volatile and non-volatile memory, or acombination of different types of memory. In some instances, the memory504 may include a non-transitory computer-readable medium. The memory504 may store instructions 506. The instructions 506 may includeinstructions that, when executed by the processor 502, cause theprocessor 502 to perform operations described herein, for example,aspects of FIGS. 2, 3, 6-11 , and 13. Instructions 506 may also bereferred to as code, which may be interpreted broadly to include anytype of computer-readable statement(s) as discussed above with respectto FIG. 4 .

The WUS processing and control module 508 may be implemented viahardware, software, or combinations thereof. For example, the WUSprocessing and control module 508 may be implemented as a processor,circuit, and/or instructions 506 stored in the memory 504 and executedby the processor 502. In some examples, the WUS processing and controlmodule 508 can be integrated within the modem subsystem 512. Forexample, the WUS processing and control module 508 can be implemented bya combination of software components (e.g., executed by a DSP or ageneral processor) and hardware components (e.g., logic gates andcircuitry) within the modem subsystem 512.

The WUS processing and control module 508 may be used for variousaspects of the present disclosure, for example, aspects of FIGS. 2, 3,6-11, and 13 . The WUS processing and control module 508 can beconfigured to transmit a default wake-up configuration associated with adiscontinuous reception (DRX) operation, determine whether to transmit aWUS during a WUS occasion based on a traffic load, transmit a physicaldownlink control channel (PDCCH) signal during a duration associatedwith the WUS occasion, transmit a WUS during a WUS occasion, and/orperform other functionalities of a BS related to the wake-up proceduresdescribed in the present disclosure.

As shown, the transceiver 510 may include the modem subsystem 512 andthe RF unit 514. The transceiver 510 can be configured to communicatebi-directionally with other devices, such as the UEs 115 and/or 400and/or another core network element. The modem subsystem 512 may beconfigured to modulate and/or encode data according to a MCS (e.g., aLDPC coding scheme, a turbo coding scheme, a convolutional codingscheme, a digital beamforming scheme, etc.). The RF unit 514 may beconfigured to process (e.g., perform analog to digital conversion ordigital to analog conversion, etc.) modulated/encoded data (e.g.,default wake-up configurations, WUSs; PDCCH signals, RRC signals, MAC CEsignals, etc.) from the modem subsystem 512 (on outbound transmissions)or of transmissions originating from another source, such as a UE 115 or400. The RF unit 514 may be further configured to perform analogbeamforming in conjunction with the digital beamforming. Although shownas integrated together in transceiver 510, the modem subsystem 512and/or the RF unit 514 may be separate devices that are coupled togetherat the BS 105 to enable the BS 105 to communicate with other devices.

The RF unit 514 may provide the modulated and/or processed data, (e.g.,data packets or, more generally, data messages that may contain one ormore data packets and other information) to the antennas 516 fortransmission to one or more other devices. This may include, forexample, transmission of information to a UE 115 or 400 according toaspects of the present disclosure. The antennas 516 may further receivedata messages transmitted from other devices and provide the receiveddata messages for processing and/or demodulation at the transceiver 510.The transceiver 510 may provide the demodulated and decoded data (e.g.,RACH message(s), ACK/NACKs for WUSs, ACK/NACKs for PDCCH signals, ULdata, ACK/NACKs for DL data, etc.) to the WUS processing and controlmodule 508 for processing. The antennas 516 may include multipleantennas of similar or different designs in order to sustain multipletransmission links.

In an embodiment, the BS 500 can include multiple transceivers 510implementing different RATs (e.g., NR and LTE). In an embodiment, the BS500 can include a single transceiver 510 implementing multiple RATs(e.g., NR and LTE). In an embodiment, the transceiver 510 can includevarious components, where different combinations of components canimplement different RATs.

FIG. 6 illustrates a scheduling/transmission configuration 600 of awireless communication method according to some aspects of the presentdisclosure. As shown, the scheduling/transmission configuration 600 issimilar in some respects to scheduling/transmission configuration 200described above with respect to FIG. 2 . However, thescheduling/transmission configuration 600 of FIG. 6 also shows a BSoperating in a DTX mode along with the UE operating a DRX/C-DRX mode inaccordance with the present disclosure.

At 610, the UE is in a sleep state. At WUS occasion 620, a WUS 622 istransmitted by a BS. The UE can monitor for the WUS 622 during WUSoccasion 620 (e.g., using a wake-up search space set). The WUS occasion620 is followed by an offset 630, during which the UE can return to asleep state. The offset 630 spaces the WUS occasion 620 from anassociated on-duration 640. During the on-duration 640, the UE is anactive state and may monitor PDCCH or other signals from the BS and/ortransmit UL data to the BS, as indicated by UL/DL communication block642. In this regard, in some instances the UE performs PDCCH monitoringduring the on-duration 640 based on information received in the WUS 622.For example, the WUS 622 may instruct the UE to execute one or more ofan aperiodic channel state reference signal (A-CSI-RS) triggering, aPDCCH monitoring reduction, a bandwidth part (BWP) switch, or asecondary cell (Scell) wake-up. Additionally, the WUS 622 may includePDCCH monitoring parameters, such as PDCCH monitoring duration, PDCCHmonitoring periodicity, number of candidates for PDCCH blind decoding,for PDCCH monitoring during the on-duration 640.

Scheduling/transmission configuration 600 continues with the UE in asleep state 650, followed by another WUS occasion 660. However, in WUSoccasion 660 the BS does not transmit a WUS. Instead, the BS refrainsfrom transmitting a WUS as part of operating in a DTX mode. In someinstances, the BS refrains from transmitting a WUS during the WUSoccasion 660 based on a traffic load (e.g., a heavy traffic load or asparse traffic load). Offset 670 spaces the WUS occasion 660 from anassociated on-duration 680 where DL/UL communications 682 occur. Duringthe on-duration 680, the UE may be in an active state or a sleep state.In some instances, a default wake-up configuration dictates whether theUE is in an active state or a sleep state during on-duration 680. The UEcan receive the default wake-up configuration from the BS (e.g., viaradio resource control (RRC) signaling, PDCCH signaling, media accesscontrol (MAC) control element (CE) signaling, L1/L2 signaling, or othersignaling). In this regard, the default wake-up configuration may bestatic, semi-static, and/or dynamically configured. In some instances,the default wake-up configuration controls how the UE performs PDCCHmonitoring during one or more DRX on-durations following a BS nottransmitting a WUS during a WUS occasion as part of a DTX operation.

FIG. 7A illustrates a scheduling/transmission configuration 700 of awireless communication method according to some aspects of the presentdisclosure. FIG. 7A illustrates a scheduling/transmission configuration700 similar to those of FIGS. 2 and 6 but shows an example of a UEperforming active PDCCH monitoring during one or more DRX on-durationsfollowing a BS not transmitting a WUS during a WUS occasion (e.g., aspart of a DTX operation). In this regard, items 710, 720, 722, 730, 740,742, 750, 760, 770, 780, and 782 of scheduling/transmissionconfiguration 700 correspond to items 610, 620, 622, 630, 640, 642, 650,660, 670, 680, and 682 of scheduling/transmission configuration 600 ofFIG. 6 , respectively. Accordingly, for sake of brevity the descriptionswill not be repeated here. Please refer to the description of thesimilar and/or corresponding items of scheduling/transmissionconfiguration 200 of FIG. 2 and/or scheduling/transmission configuration600 of FIG. 6 for additional details.

As shown in FIG. 7A, the UE performs WUS monitoring 724 during WUSoccasion 720. As discussed above, the UE can perform WUS monitoring 724based on a WUS configuration received from the network and/or the BS. Inthis regard, the WUS configuration can indicate to the UE resources(e.g., search space including time and frequency resources, periodicity,channel, BWP, frequency carrier, etc.) associated with the WUS occasion720, format information for the WUS (e.g., message structure), etc.Based on the WUS monitoring 724, the UE will receive the WUS 722. Duringthe on-duration 740, the UE is an active state and may monitor PDCCH orother signals from the BS and/or transmit UL data to the BS, asindicated by UL/DL communication block 742. In this regard, in theillustrated example of FIG. 7A the UE performs PDCCH monitoring 744during the on-duration 740. The UE can perform the PDCCH monitoring 744based on information received in the WUS 722. For example, the WUS 722may instruct the UE to execute one or more of an aperiodic channel statereference signal (A-CSI-RS) triggering, a PDCCH monitoring reduction, abandwidth part (BWP) switch, or a secondary cell (Scell) wake-up.Additionally, the WUS 722 may include PDCCH monitoring parameters, suchas PDCCH monitoring duration, PDCCH monitoring periodicity, number ofcandidates for PDCCH blind decoding, for PDCCH monitoring during theon-duration 740.

As also shown in FIG. 7A, the UE performs WUS monitoring 764 during WUSoccasion 760. This can be similar to WUS monitoring 724 during WUSoccasion 720. However, as shown, during WUS 760 the BS does not transmita WUS and/or the UE does not detect/receive a WUS. In some instances,the BS does not transmit a WUS during WUS occasion 760 as part of a DTXoperation. More specifically, in some instances the BS does not transmita WUS during WUS occasion 760 based on a traffic load (e.g., heavytraffic load or sparse traffic load). Despite not receiving a WUS duringWUS occasion 760, the UE is an active state during the on-duration 780and may monitor PDCCH or other signals from the BS and/or transmit ULdata to the BS, as indicated by UL/DL communication block 782. In thisregard, in the illustrated example of FIG. 7A the UE performs PDCCHmonitoring 784 during the on-duration 780 associated with WUS occasion760. The UE can actively perform the PDCCH monitoring 784 based on adefault wake-up configuration received from the BS (e.g., via RRCsignaling, PDCCH signaling, media access control (MAC) control element(CE) signaling, L1/L2 signaling, or other signaling). For example, thedefault wake-up configuration may instruct the UE to execute one or moreof an aperiodic channel state reference signal (A-CSI-RS) triggering, aPDCCH monitoring reduction, a bandwidth part (BWP) switch, or asecondary cell (Scell) wake-up in one or more on-durations associatedwith the WUS occasion 760 when the UE does not receive and/or detect aWUS from the BS during WUS occasion 760.

FIG. 7B illustrates a scheduling/transmission configuration 790 of awireless communication method according to some aspects of the presentdisclosure. FIG. 7B illustrates a scheduling/transmission configuration790 similar to those of FIGS. 2, 6 , and 7A, but shows an example of aUE skipping PDCCH monitoring—by remaining in a sleep state—during one ormore DRX on-durations following a BS not transmitting a WUS during a WUSoccasion (e.g., as part of a DTX operation). More specifically, in theillustrated example of FIG. 7B the UE does not perform PDCCH monitoringduring the on-duration 780 and, instead, remains in a sleep state 786during the on-duration 780 associated with WUS occasion 760. The UE canbe in sleep state 786 based on a default wake-up configuration receivedfrom the BS (e.g., via RRC signaling, PDCCH signaling, media accesscontrol (MAC) control element (CE) signaling, or other signaling). Forexample, the default wake-up configuration may instruct the UE to skipPDCCH monitoring and/or otherwise utilize a sleep state in one or moreon-durations associated with the WUS occasion 760 when the UE does notreceive and/or detect a WUS from the BS during WUS occasion 760.

FIG. 8A illustrates a protocol diagram of a wireless communicationmethod 800 according to some aspects of the present disclosure. Morespecifically, FIG. 8A illustrates a method 800 corresponding to thescheduling/transmission configuration 700 of FIG. 7A or similarscheduling/transmission configuration showing an example of a UEperforming active PDCCH monitoring during one or more DRX on-durationsfollowing a BS not transmitting a WUS during a WUS occasion (e.g., aspart of a DTX operation).

As shown, the method 800 includes a BS transmitting a default wake-upconfiguration 810 to a UE in an active state. The default wake-upconfiguration 810 can be transmitted to the active state UE via RRC,PDCCH, MAC CE, L1/L2 signaling, or other suitable signaling.

The method 800 also includes the BS transmitting WUS 820 to the UE (or agroup of UEs). In this regard, the UE performs WUS monitoring for theWUS 820 following a sleep state. In some instances, the UE performs theWUS monitoring in accordance with a WUS configuration.

The method 800 also includes the BS transmitting PDCCH signaling 830.Following an offset period, the UE performs PDCCH monitoring. In someinstances, the UE performs PDCCH monitoring for the PDCCH signaling 830based on information in the WUS 820. In this regard, the WUS 820 mayindicate for the UE to perform active PDCCH monitoring during theon-duration in which PDCCH signaling 830 is transmitted.

The method 800 also includes the BS refraining from transmitting a WUS,as indicated by 840, during a WUS occasion, for example, to save systemresources. In this regard, the method 800 includes the UE determiningthat a WUS was not received from the BS during the WUS occasion based onits WUS monitoring.

The method 800 also includes the BS transmitting PDCCH signaling 850.Following an offset period, the UE performs PDCCH monitoring. In someinstances, the UE performs PDCCH monitoring for the PDCCH signaling 850based on the default wake-up configuration 810 received from the BS. Inthis regard, the default wake-up configuration 810 may indicate for theUE to perform active PDCCH monitoring during the on-duration in whichPDCCH signaling 850 is transmitted, as shown in FIG. 8A.

FIG. 8B illustrates a protocol diagram of a wireless communicationmethod 860 according to some aspects of the present disclosure. Morespecifically, FIG. 8B illustrates a method 860 corresponding to thescheduling/transmission configuration 790 of FIG. 7B or similarscheduling/transmission configuration showing an example of a UEskipping PDCCH monitoring—by remaining in a sleep state—during one ormore DRX on-durations following a BS not transmitting a WUS during a WUSoccasion (e.g., as part of a DTX operation). In this regard, the method860 is similar in many respects to method 800, including steps 810, 820,830, and 840. However, in method 860 the BS refrains from transmittingPDCCH signaling to the UE (or group of UEs), as indicated by 870. Thatis, the BS does not transmit PDCCH signaling for the UE (or group ofUEs) after refraining from transmitting a WUS during the WUS occasion.In some instances, the UE also skips PDCCH monitoring based on thedefault wake-up configuration 810 received from the BS. In this regard,the default wake-up configuration 810 may, as shown in FIG. 8B, indicatefor the UE to skip PDCCH monitoring during an on-duration correspondingto the WUS occasion in which the BS refrains from transmitting a WUS.

FIG. 9 illustrates a protocol diagram of a wireless communication method900 according to some aspects of the present disclosure. Morespecifically, FIG. 9 illustrates a method 900 showing an example of a UEoperating using two different wake-up configurations in accordance withthe present disclosure.

As shown, the method 900 includes a BS transmitting a default wake-upconfiguration 910 to a UE in an awake state or active state. The defaultwake-up configuration 910 can be transmitted to the active state UE viaRRC, PDCCH, MAC CE, or other suitable signaling.

The method 900 also includes the BS refraining from transmitting a WUSto the UE (or a group of UEs), as indicated by 920, during a WUSoccasion. The UE performs WUS monitoring and determines, as part ofmethod 900, that a WUS was not received from the BS during the WUSoccasion. In this regard, the UE performs WUS monitoring following asleep state. In some instances, the UE performs the WUS monitoring inaccordance with a WUS configuration.

The method 900 also includes the BS transmitting PDCCH signaling 930.Following an offset period, the UE performs PDCCH monitoring inaccordance with a first wake-up configuration (e.g., PDCCH MonitoringMode 1 in FIG. 9 ). In some instances, the UE performs PDCCH monitoringfor the PDCCH signaling 930 based on the default wake-up configuration910 received from the BS. In this regard, the default wake-upconfiguration 910 may indicate for the UE to operate utilizing the firstwake-up configuration (e.g., PDCCH Monitoring Mode 1) for a certainamount of time, until a timer expires, and/or until another changecondition (e.g., a threshold number (e.g., 1, 2, 3, 4, 5, etc.) of DRXduty cycles and/or WUS occasions occur, UL or DL communication isinitiated) is met and then operate in a second, different wake-upconfiguration (e.g., PDCCH Monitoring Mode 2 in FIG. 9 ). In someinstances, the first wake-up configuration (e.g., PDCCH MonitoringMode 1) is a default or fallback wake-up configuration such that the UEoperates in the first wake-up configuration unless and until a certaincondition is met (e.g., certain amount of time passes, a timer expires,threshold number of WUS occasions pass, UL communication is initiated,DL communication is initiated, etc.), at which point the UE will switchto the second wake-up configuration (e.g., PDCCH Monitoring Mode 2). Inother instances, the second wake-up configuration (e.g., PDCCHMonitoring Mode 2) is a default or fallback wake-up configuration suchthat the UE operates in the first wake-up configuration until a certaincondition is met (e.g., certain amount of time passes, a timer expires,threshold number of WUS occasions pass, UL communication is initiated,DL communication is initiated, etc.), at which point the UE will fallback to the default, second wake-up configuration.

In the illustrated embodiment of FIG. 9 , the first wake-upconfiguration (PDCCH Monitoring Mode 1) is shown ending at the end of aUE sleep state and the beginning of a WUS occasion in which the UE willperform WUS monitoring. However, it is understood that the first wake-upconfiguration (PDCCH Monitoring Mode 1) may end, and another wake-upconfiguration begin, at any time based on a timer, condition, or otherparameter. Further, while FIG. 9 illustrates the UE operating in twodifferent wake-up configurations, it is understood that the UE mayoperate in any number of different wake-up configurations. In thisregard, in some instances the UE may store two or more wake-upconfigurations in memory and the BS may provide an indication as towhich of the stored wake-up configurations the UE is to use (and forwhat period of time). Further, the BS may provide the UE with updatedwake-up configurations for local storage by the UE from time to time. Inthis manner, both the available wake-up configurations as well as theactual wake-up configuration being implemented by the UE can besemi-statically and/or dynamically updated over time.

FIG. 10 illustrates a protocol diagram of a wireless communicationmethod 1000 according to some aspects of the present disclosure. Morespecifically, FIG. 10 illustrates a method 1000 similar to method 800 ofFIG. 8A and corresponding to the scheduling/transmission configuration700 of FIG. 7A or similar scheduling/transmission configuration butillustrating an example where the UE receives a default wake-upconfiguration from the BS as part of a WUS. As shown, at step 1020, themethod 1000 includes the BS transmitting a WUS to the UE (or group ofUEs) that includes a default wake-up configuration. The WUS with thedefault wake-up configuration may be transmitted via PDCCH or othersuitable signaling. The remaining steps of method 1000 (e.g., 1030,1040, and 1050) are similar to steps 830, 840, and 850 of method 800 andthe associated UE actions shown in FIG. 8A. However, in other instancesthe remaining steps of method 1000 (e.g., 1030, 1040, and 1050) aresimilar to steps 830, 840, and 870 of method 860 and the associated UEactions shown in FIG. 8B.

In some instances, the UE receives the default wake-up configuration oran indication as to which default wake-up configuration to utilize in amanner other than from a BS. For example, the default wake-upconfiguration can be mandated by specification (i.e., without signaling)in some instances. Additionally, the UE may be pre-programmed (e.g., inmemory 404) with one or more default wake-up configurations. In someimplementations, the UE utilizes the pre-programmed default wake-upconfiguration(s) based on one or more of operating conditions (e.g.,connection status, BWP, carrier, geographical location, priority,service, subscription, etc.). In this regard, each of the pre-programmeddefault wake-up configuration(s) may be associated with one or more ofthe operating conditions and the UE selects an appropriate default wakeconfiguration based on the current operating conditions. In someinstances, the UE may receive an indication from the BS as to which ofthe pre-programmed default wake-up configurations to utilize. Furtherstill, in some instances the UE may be the default wake-up configurationfrom another UE (e.g., through a peer-to-peer communication). Forexample, a UE may receive the default wake-up configuration from anotherUE in a common group (e.g., based on BWP, carrier, geographicallocation, priority, service, subscription, etc.). In yet otherinstances, the UE may receive the default wake-up configuration from oneor more other network devices.

FIG. 11 illustrates a protocol diagram of a wireless communicationmethod 1100 according to some aspects of the present disclosure. Morespecifically, FIG. 11 illustrates a method 1100 showing communicationsbetween a BS and multiple UEs as part of a DRX/DTX wake up procedure inaccordance with the present disclosure.

As shown, the method 1100 includes a BS transmitting one or more defaultwake-up configurations 1110 to multiple UEs (i.e., UE1, UE2, and UE3 inFIG. 11 ). The UEs may be in an awake state or active state whenreceiving the default wake-up configuration(s) 1110. The default wake-upconfiguration(s) 1110 can be transmitted to the active state UEs viaRRC, PDCCH, MAC CE, or other suitable signaling. In some instances, thedefault wake-up configuration(s) 1110 are communicated to the UEs aspart of a WUS (see, e.g., FIG. 10 ). The UEs may receive the same ordifferent wake-up configurations 1110. For example, in someimplementations UEs are grouped based on BWP, carrier, geographicallocation, priority, service, subscription, and/or other factors. UEs ina common group can receive the same wake-up configuration 1110. In otherinstances, the wake-up configurations 1110 are UE-specific. In thisregard, UEs within a common group can receive different default wake-upconfigurations 1110 (e.g., based on a UE's traffic load).

The method 1100 also includes the BS transmitting WUS(s) 1120 to theUEs. In this regard, UEs in a common group can be configured to receivethe same WUS 1120 and/or portion of the WUS (see, e.g., message format300). For example, in the illustrated example of FIG. 11 , a grouping1122 indicates that the same WUS (or portion) is being sent to UE1 andUE2. In this regard, UE1 and UE2 can be part of a common group (e.g.based on BWP, carrier, geographical location, priority, service,subscription, and/or other factors) or otherwise be configured toreceive the same WUS (or portion) from the BS. In other instances,different WUS(s) or (portions) are sent to each UE. In some instances,the UEs monitor for the WUS 1120 in accordance with a WUS configuration.The WUS configuration may be common for a group of UEs and/orUE-specific.

The method 1100 also includes the BS transmitting PDCCH signaling 1130to the UEs. The UEs can perform PDCCH monitoring for the PDCCH signaling1130 based on information in the WUS(s) 1120. In this regard, the WUS(s)1120 may indicate for the UE to perform active PDCCH monitoring duringthe DRX on-duration in which PDCCH signaling 1130 is transmitted.

The method 1100 also includes the BS refraining from transmitting a WUS,as indicated by 1140, during a WUS occasion, for example, to save systemresources. In this regard, the method 1100 can includes the UEsdetermining that a WUS was not received from the BS during the WUSoccasion based on WUS monitoring.

The method 1100 also includes the BS transmitting PDCCH signaling 1150.In some instances, the UEs perform PDCCH monitoring for the PDCCHsignaling 1150 based on the default wake-up configuration(s) 1110received from the BS. In this regard, the default wake-upconfiguration(s) 1110 may indicate a UE to perform active PDCCHmonitoring during the DRX on-duration in which PDCCH signaling 1150 istransmitted. Alternatively, the default wake-up configuration(s) 1110may indicate a UE to remain in a sleep state during the DRX on-durationin which PDCCH signaling 1150 is transmitted. For example, FIG. 11 showstwo UEs performing active PDCCH monitoring (i.e., UE1 performing activePDCCH monitoring 1152 and UE2 performing active PDCCH monitoring 1154),while another UE remains in a sleep state (i.e., UE3 remains in sleepstate 1156). In this regard, UEs in a common group (e.g., UE1 and UE2 inFIG. 11 ) may be configured with the same default wake-up configurationsuch that the UEs in the common group perform PDCCH monitoring in thesame manner when a WUS signal is not received from a BS during a wake-upoccasion. While FIG. 9 shows an example with three UEs, it is understoodthat the concepts of the present disclosure are applicable to any numberof UEs (e.g., 5, 10, 15, 20, 50, 100, or more).

FIG. 12 is a flow diagram of a communication method 1200 according tosome aspects of the present disclosure. Aspects of the method 1200 canbe executed by a wireless communication device, such as the UEs 115and/or 400 utilizing one or more components, such as the processor 402,the memory 404, the WUS processing and control module 408, thetransceiver 410, the modem 412, the one or more antennas 416, andvarious combinations thereof. As illustrated, the method 1200 includes anumber of enumerated steps, but the method 1200 may include additionalsteps before, after, and in between the enumerated steps. For example,in some instances one or more aspects of methods 800, 860, 900, 1000,and/or 1100, scheduling/transmission configurations 200, 600, 700,and/or 790, and/or message structure 300 may be implemented as part ofmethod 1200. In some instances, one or more of the enumerated steps maybe omitted or performed in a different order.

At step 1210, the method 1200 includes receiving, by a user equipment(UE) from a base station (BS), a default wake-up configurationassociated with a discontinuous reception (DRX) operation. In someinstances, step 1210 includes receiving, by the UE from the BS, thedefault wake-up configuration via at least one of radio resource control(RRC) signaling, PDCCH signaling, or media access control (MAC) controlelement (CE) signaling. In some instances, the default wake-upconfiguration includes an indication to the UE to execute one or more ofan aperiodic channel state reference signal (A-CSI-RS) triggering, aPDCCH monitoring reduction, a bandwidth part (BWP) switch, or asecondary cell (Scell) wake-up.

In some instances, the received default wake-up configuration includesan indication to the UE to operate in a first wake-up configuration oroperate in a second, different wake-up configuration. In some instances,the method 1200 includes operating, by the UE, using the first wake-upconfiguration for a first time period and operating, by the UE, usingthe second wake-up configuration for a second time period. In thisregard, the UE may operate in the first time period and/or the secondtime period based on one or more timers. For example, the defaultwake-up configuration may cause the UE to operate in a first wake-upconfiguration until a timer expires or other change condition (e.g., athreshold number (e.g., 1, 2, 3, 4, 5, etc.) of DRX duty cycles and/orWUS occasions occur, an UL or DL communication is initiated, etc.) ismet and then operate in the second, different wake-up configuration. Thedefault wake-up configuration may also cause the UE to operate in atemporary wake-up configuration, then revert back to a defaultconfiguration after some amount of time or upon some condition beingmet. Any number of different wake-up configurations may be implementedby the BS and/or the UE over time. In this regard, in some instances theUE may store two or more wake-up configurations in memory (e.g., memory404). The BS may provide an indication to the UE as to which of thewake-up configuration(s) to implement, including for how long (e.g.,based on a timer and/or condition). In some instances, the indication tothe UE as to which of the wake-up configuration(s) to implement and forwhat duration is included as part of the default wake-up configurationreceived at step 1210.

At step 1220, the method 1200 includes monitoring, by the UE during awake-up signal (WUS) occasion, for a WUS from the BS. The UE can monitorfor the WUS based on a WUS configuration received from the BS. In thisregard, the method 1200 can include receiving a WUS configuration fromthe BS. The WUS configuration for the UE, or an associated group of UEsto which the UE belongs, can be fixed, semi-static, and/or dynamicallyconfigured by the BS. In some instances, the WUS configuration isreceived by the UE as part of the WUS transmitted during the WUSoccasion. The WUS configuration can indicate to the UE resources (e.g.,search spaces including time and frequency, periodicity, channel, BWP,frequency carrier, etc.) associated with a WUS occasion, WUS format,etc. The UE can utilize the information from the WUS configuration tomonitor for, receive, and/or decode the WUS.

At step 1230, the method 1200 includes determining, by the UE, whetherthe WUS was received from the BS during the WUS occasion. The UE mayutilize the information from the WUS configuration to determine whethera WUS has been received from the BS. For example, if the UE monitors theresources associated with the WUS occasion and does not detect a WUS,then the UE can determine that a WUS was not received from the BS duringthe WUS occasion. Additionally, the UE may use an identifier (e.g.,PS-RNTI, C-RNTI, etc.) associated with the UE, or a group of UEs, todetermine whether a WUS has been received from the BS. For example, ifthe UE does not receive wake-up downlink control information or WUSaddressed to an identifier associated with the UE (or group of UEs thatthe UE is a part of), then the UE can determine that a WUS was notreceived from the BS during the WUS occasion.

At step 1240, the method 1200 includes performing, by the UE, physicaldownlink control channel (PDCCH) monitoring based on the default wake-upconfiguration and whether the WUS was received from the BS during theWUS occasion. If the UE receives the WUS from the BS during the WUSoccasion, then the UE can perform PDCCH monitoring in accordance withthe information in the WUS. For example, the WUS may indicate to the UEto trigger an aperiodic channel state reference signal (A-CSI-RS), use areduced PDCCH monitoring frequency, perform a bandwidth part (BWP)switch, perform a secondary cell (Scell) wake-up, and/or utilize otherPDCCH monitoring techniques. Further, the WUS may indicate to the UE toskip PDCCH monitoring (e.g., remain in a sleep state) for one or more ofthe on-durations associated with the WUS occasion.

The default wake-up configuration can dictate how the UE operates in theevent the UE does not receive, at step 1230, a WUS from the BS duringthe WUS occasion. The default wake-up configuration for the UE, or anassociated group of UEs to which the UE belongs, can be fixed,semi-static, and/or dynamically configured by the BS. In some instances,the default wake-up configuration will cause the UE to skip PDCCHmonitoring in one or more on-durations associated with the WUS occasionin response to determining that the WUS was not received from the BSduring the WUS occasion. In some implementations, the UE skips PDCCHmonitoring by remaining in a sleep state in the one or moreon-durations, providing additional power savings to the UE. In otherinstances, the default wake-up configuration causes the UE to activelyperform PDCCH monitoring in one or more on-durations associated with theWUS occasion in response to determining that the WUS was not receivedfrom the BS during the WUS occasion. In this regard, the default wake-upconfiguration may indicate to the UE aspects related to performing thePDCCH monitoring. For example, the default wake-up configuration mayindicate to the UE to trigger an aperiodic channel state referencesignal (A-CSI-RS), use a reduced PDCCH monitoring frequency, perform abandwidth part (BWP) switch, perform a secondary cell (Scell) wake-up,and/or utilize other PDCCH monitoring techniques. In some instances, thedefault wake-up configuration is semi-statically and/or dynamicallyupdated based on a traffic load condition (e.g., for a group of UEs, aBWP, a carrier, etc.). The default wake-up configuration may besemi-statically and/or dynamically configured over time to selectwhether the UE remains in a sleep state during one or more on-durationsassociated with a WUS occasion (e.g., during sparse traffic conditions)or actively monitors PDCCH during one or more on-durations associatedwith the WUS occasion (e.g., during heavy traffic conditions).

In addition, according to some aspects, BSs and UEs may utilize avariety of varying wake up configurations. For example, a BS maydetermine to provide differing wake up configurations to different UEsor other devices in a BS's cell. In this manner, and according tovarious aspects, different types of UEs have differing default wake upconfigurations with different wake up characteristics. For example, afirst UE may have an initial/first wake up configuration and another UEmay have a different wake up configuration. In scenarios where a BSinteracts with a number of UEs of different classes or types, providinga variety of different wake up configurations enables a BS to provideUE-specific wake up configurations helping to conserve power andprocessing resources. By dynamically controlling wake up configurations,BSs can tailor specific operational behaviors to one or more specificUEs in a communications network.

FIG. 13 is a flow diagram of a communication method 1300 according tosome aspects of the present disclosure. Aspects of the method 1300 canbe executed by a wireless communication device, such as the BSs 105and/or 500 utilizing one or more components, such as the processor 502,the memory 504, the WUS processing and control module 508, thetransceiver 510, the modem 512, the one or more antennas 516, andvarious combinations thereof. As illustrated, the method 1300 includes anumber of enumerated steps, but the method 1300 may include additionalsteps before, after, and in between the enumerated steps. For example,in some instances one or more aspects of methods 800, 860, 900, 1000,and/or 1100, scheduling/transmission configurations 200, 600, 700,and/or 790, and/or message structure 300 may be implemented as part ofmethod 1300. In some instances, one or more of the enumerated steps maybe omitted or performed in a different order.

At step 1310, the method 1300 includes transmitting, by a base station(BS) to a user equipment (UE), a default wake-up configurationassociated with a discontinuous reception (DRX) operation. In someinstances, step 1310 includes transmitting, by the BS to the UE, thedefault wake-up configuration via at least one of radio resource control(RRC) signaling, PDCCH signaling, or media access control (MAC) controlelement (CE) signaling. In some instances, the default wake-upconfiguration includes an indication to the UE to execute one or more ofan aperiodic channel state reference signal (A-CSI-RS) triggering, aPDCCH monitoring reduction, a bandwidth part (BWP) switch, or asecondary cell (Scell) wake-up. The default wake-up configuration forthe UE, or an associated group of UEs to which the UE belongs, can befixed, semi-static, and/or dynamically configured by the BS. To thisend, the BS may transmit an updated default wake-up configuration fromtime to time. In some instances, the default wake-up configuration issemi-statically and/or dynamically updated by the BS based on a trafficload condition (e.g., for a group of UEs, a BWP, a carrier, etc.). Thedefault wake-up configuration may be semi-statically and/or dynamicallyconfigured to select whether the UE remains in a sleep state during oneor more on-durations associated with a WUS occasion (e.g., during sparsetraffic conditions) or actively monitors PDCCH during one or moreon-durations associated with the WUS occasion (e.g., during heavytraffic conditions).

At step 1320, the method 1300 includes determining, by the BS, whetherto transmit a wake-up signal (WUS) to the UE during a WUS occasion basedon a traffic load. In a sparse traffic scenario, the likelihood of awake-up being needed for each UE in a wake-up group (e.g., sharing thesame PDCCH-WUS) is very small. As a result, most of the time the wake-upindicator(s) of the WUS would be all zeros, or otherwise indicate thatthe UEs should remain in a sleep state during one or more on-durationsassociated with the WUS occasion. On the other hand, in a heavy trafficscenario, the likelihood of a wake-up being needed for each UE in thewake-up group is very high. Accordingly, most of the time in suchsituations the wake-up indicators would be all ones, or otherwiseindicate that the UEs should actively monitor PDCCH during one or moreon-durations associated with the WUS occasion.

In such sparse traffic and heavy traffic scenarios, the BS may refrainfrom transmitting a WUS during a WUS occasion. In addition to reducingnetwork traffic and potential interference, the BS refraining fromtransmitting the WUS can also provide power savings to both the BS andthe UE. To this end, in some instances the BS determines not to transmitthe WUS to the UE during the WUS occasion if the traffic load is below afirst threshold and determines to transmit the WUS to the UE during theWUS occasion if the traffic load is above a second threshold. The firstand second thresholds can be the same or different. For example, in someinstances, the traffic load is evaluated based on the number of wake-upindicators of WUS that will be the same for a particular WUS and/or WUSoccasion. In this regard, the threshold for determining not to transmitthe WUS versus the threshold for determining to transmit the WUS may bethe same or different. For example, if more than a threshold percentage(e.g., 50%, 60%, 70%, 75%, 80%, 90%, etc.) and/or a threshold number(e.g., 2, 3, 4, 5, 6, 7, 8, etc.) of the wake-up indicators will be thesame, then the BS may refrain from transmitting the WUS, regardless ofwhether the common indicators will indicate for the UEs to wake-up orremain in a sleep state. As another example, the threshold percentageand/or the threshold number of the wake-up indicators needed to be thesame for the BS to refrain from transmitting the WUS can be differentdependent on whether the common indicators indicate for the UEs towake-up or remain in a sleep state. In this regard, the thresholdpercentage and/or the threshold number may be higher when the commonindicators indicate for the UEs to wake-up than when the commonindicators indicate for the UEs to remain in a sleep state, or viceversa.

At step 1330, the method 1300 includes, based on the determination atstep 1320, either (1) transmitting a WUS signal to the UE during the WUSoccasion or (2) refraining from transmitting a WUS signal to the UEduring the WUS occasion. When the BS transmits the WUS, the BS canutilize the message structure of FIG. 3 or any other suitable messagestructure (e.g., including all wake-up indicators prior to all wake-upinformation fields, including all wake-up information fields prior toall wake-up indicators, interleaving wake-up indicators and wake-upinformation fields, etc.). In some instances, the WUS transmitted by theBS during the WUS occasion includes a WUS configuration for the UE (orgroup of UEs). The WUS configuration can indicate to the UE theresources (e.g., search spaces including time and frequency,periodicity, channel, BWP, frequency carrier, etc.) associated with aWUS occasion, WUS format, etc. In some instances, the WUS transmitted bythe BS during the WUS occasion includes a default wake-up configuration.

When the BS does not transmit a WUS at step 1330, the UE(s) can operateaccording to the default wake-up configuration transmitted at step 1310.In some instances, the default wake-up configuration sent at step 1310indicates to the UE to operate in a first wake-up configuration or asecond, different wake-up configuration. In some instances, the defaultwake-up configuration sent at step 1310 indicates to the UE to operateusing the first wake-up configuration for a first time period andoperate using the second wake-up configuration for a second time period.In this regard, the UE may operate in the first time period and/or thesecond time period based on one or more timers. For example, the defaultwake-up configuration may cause the UE to operate in a first wake-upconfiguration until a timer expires or other change condition (e.g., athreshold number (e.g., 1, 2, 3, 4, 5, etc.) of DRX duty cycles and/orWUS occasions occur, an UL or DL communication is initiated, etc.) ismet and then operate in the second, different wake-up configuration.That is, the default wake-up configuration may cause the UE to operatein a temporary wake-up configuration, then revert back to a defaultconfiguration after some amount of time or upon some condition beingmet. Any number of different wake-up configurations may be implementedby the BS and/or the UE over time. As discussed above, the defaultwake-up configuration may be semi-statically and/or dynamicallyconfigured to select whether the UE remains in a sleep state or activelymonitors PDCCH during one or more on-durations associated with a WUSoccasion.

At step 1340, the method 1300 includes transmitting, by the BS, aphysical downlink control channel (PDCCH) signal during a durationassociated with the WUS occasion. In this regard, the durationassociated with the WUS occasion can include one or more discontinuousreception (DRX) on-durations associated with the WUS occasion. Asdiscussed above, the default wake-up configuration transmitted as step1310 can dictate how the UE performs PDCCH monitoring during theduration associated with the WUS occasion in the event the BS does nottransmit a WUS during the WUS occasion. In some instances, the defaultwake-up configuration from step 1310 will cause the UE to skip PDCCHmonitoring in one or more on-durations associated with the WUS occasionin response to determining that the WUS was not received from the BSduring the WUS occasion. In other instances, the default wake-upconfiguration transmitted at step 1310 causes the UE to actively performPDCCH monitoring in one or more on-durations associated with the WUSoccasion in response to determining that the WUS was not received fromthe BS during the WUS occasion. That is, the UE will monitor for thePDCCH signal transmitted at 1340 in such instances.

Information and signals may be represented using any of a variety ofdifferent technologies and techniques. For example, data, instructions,commands, information, signals, bits, symbols, and chips that may bereferenced throughout the above description may be represented byvoltages, currents, electromagnetic waves, magnetic fields or particles,optical fields or particles, or any combination thereof.

The various illustrative blocks and modules described in connection withthe disclosure herein may be implemented or performed with ageneral-purpose processor, a DSP, an ASIC, an FPGA or other programmablelogic device, discrete gate or transistor logic, discrete hardwarecomponents, or any combination thereof designed to perform the functionsdescribed herein. A general-purpose processor may be a microprocessor,but in the alternative, the processor may be any conventional processor,controller, microcontroller, or state machine. A processor may also beimplemented as a combination of computing devices (e.g., a combinationof a DSP and a microprocessor, multiple microprocessors, one or moremicroprocessors in conjunction with a DSP core, or any other suchconfiguration).

The functions described herein may be implemented in hardware, softwareexecuted by a processor, firmware, or any combination thereof. Ifimplemented in software executed by a processor, the functions may bestored on or transmitted over as one or more instructions or code on acomputer-readable medium. Other examples and implementations are withinthe scope of the disclosure and appended claims. For example, due to thenature of software, functions described above can be implemented usingsoftware executed by a processor, hardware, firmware, hardwiring, orcombinations of any of these. Features implementing functions may alsobe physically located at various positions, including being distributedsuch that portions of functions are implemented at different physicallocations. Also, as used herein, including in the claims, “or” as usedin a list of items (for example, a list of items prefaced by a phrasesuch as “at least one of” or “one or more of”) indicates an inclusivelist such that, for example, a list of [at least one of A, B, or C]means A or B or C or AB or AC or BC or ABC (i.e., A and B and C).

As those of some skill in this art will by now appreciate and dependingon the particular application at hand, many modifications, substitutionsand variations can be made in and to the materials, apparatus,configurations and methods of use of the devices of the presentdisclosure without departing from the spirit and scope thereof. In lightof this, the scope of the present disclosure should not be limited tothat of the particular embodiments illustrated and described herein, asthey are merely some examples thereof, but rather, should be fullycommensurate with that of the claims appended hereafter and theirfunctional equivalents.

What is claimed is:
 1. A method of wireless communication, comprising:transmitting, by a base station (BS) to a user equipment (UE), a defaultwake-up configuration associated with a discontinuous reception (DRX)operation; determining, by the BS, whether to transmit a wake-up signal(WUS) to the UE during a WUS occasion based on a traffic load; andtransmitting, by the BS, a physical downlink control channel (PDCCH)signal during a duration associated with the WUS occasion.
 2. The methodof claim 1, wherein the determining whether to transmit the WUS to theUE during the WUS occasion based on the traffic load includes at leastone of: determining not to transmit the WUS to the UE during the WUSoccasion based on the traffic load being below a first threshold; ordetermining to transmit the WUS to the UE during the WUS occasion basedon the traffic load being above a second threshold.
 3. The method ofclaim 1, wherein the duration associated with the WUS occasion includesone or more discontinuous reception (DRX) on-durations associated withthe WUS occasion.
 4. The method of claim 1, wherein the transmitting thedefault wake-up configuration includes: transmitting, by the BS to theUE, the default wake-up configuration via at least one of radio resourcecontrol (RRC) signaling, PDCCH signaling, or media access control (MAC)control element (CE) signaling.
 5. The method of claim 1, wherein thetransmitting the default wake-up configuration includes: transmitting,by the BS to the UE, the WUS during the WUS occasion, the WUS includingthe default wake-up configuration.
 6. The method of claim 1, wherein thetransmitting the default wake-up configuration includes: transmitting,by the BS to the UE, the default wake-up configuration having anindication for the UE to operate in a first wake-up configuration oroperate in a second wake-up configuration, the second wake-upconfiguration being different than the first wake-up configuration. 7.The method of claim 1, wherein the transmitting the default wake-upconfiguration includes: transmitting, by the BS to the UE, the defaultwake-up configuration having an indication for the UE to operate, basedon a timer, in a first wake-up configuration or a second wake-upconfiguration.
 8. The method of claim 1, wherein the transmitting thedefault wake-up configuration includes: transmitting, by the BS, thedefault wake-up configuration to a group of UEs, including the UE, basedon one or more of a bandwidth part (BWP) or a carrier associated withthe group of UEs.
 9. The method of claim 1, wherein the transmitting thedefault wake-up configuration includes: transmitting, by the BS to theUE, the default wake-up configuration having an indication for one ormore of an aperiodic channel state reference signal (A-CSI-RS)triggering, a PDCCH monitoring reduction, a bandwidth part (BWP) switch,or a secondary cell (Scell) wake-up.
 10. A base station, comprising: amemory; a transceiver; and at least one processor coupled to the memoryand the transceiver, wherein the base station is configured to:transmit, to a user equipment (UE), a default wake-up configurationassociated with a discontinuous reception (DRX) operation; transmit aphysical downlink control channel (PDCCH) signal during a durationassociated with a wake-up signal (WUS) occasion; and determine whetherto transmit a WUS to the UE during the WUS occasion based on a trafficload.
 11. The base station of claim 10, wherein the base station isfurther configured to: determine not to transmit the WUS to the UEduring the WUS occasion based on the traffic load being below a firstthreshold; or determine to transmit the WUS to the UE during the WUSoccasion based on the traffic load being above a second threshold. 12.The base station of claim 10, wherein the duration associated with theWUS occasion includes one or more discontinuous reception (DRX)on-durations associated with the WUS occasion.
 13. The base station ofclaim 10, wherein the base station is further configured to: transmit,to the UE, the default wake-up configuration via at least one of radioresource control (RRC) signaling, PDCCH signaling, or media accesscontrol (MAC) control element (CE) signaling.
 14. The base station ofclaim 10, wherein the base station is further configured to: transmit,to the UE, the WUS during the WUS occasion, the WUS including thedefault wake-up configuration.
 15. The base station of claim 10, whereinthe base station is further configured to: transmit, to the UE, thedefault wake-up configuration having an indication for the UE to operatein a first wake-up configuration or operate in a second wake-upconfiguration, the second wake-up configuration being different than thefirst wake-up configuration.
 16. The base station of claim 15, whereinthe base station is further configured to: transmit, to the UE, thedefault wake-up configuration having an indication for the UE tooperate, based on a timer, in the first wake-up configuration or thesecond wake-up configuration.
 17. The base station of claim 10, whereinthe base station is further configured to: transmit the default wake-upconfiguration to a group of UEs, including the UE, based on one or moreof a bandwidth part (BWP) or a carrier associated with the group of UEs.18. The base station of claim 10, wherein the base station is furtherconfigured to: transmit, to the UE, the default wake-up configurationhaving an indication for one or more of an aperiodic channel statereference signal (A-CSI-RS) triggering, a PDCCH monitoring reduction, abandwidth part (BWP) switch, or a secondary cell (Scell) wake-up.
 19. Anon-transitory computer-readable medium having program code recordedthereon, the program code comprising: code for causing a base station(BS) to transmit, to a user equipment (UE), a default wake-upconfiguration associated with a discontinuous reception (DRX) operation;code for causing the BS to determine whether to transmit a wake-upsignal (WUS) to the UE during a WUS occasion based on a traffic load;and code for causing the BS to transmit a physical downlink controlchannel (PDCCH) signal during a duration associated with the WUSoccasion.
 20. The non-transitory computer-readable medium of claim 19,wherein the determining whether to transmit the WUS to the UE during theWUS occasion based on the traffic load includes at least one of: codefor causing the BS to determine not to transmit the WUS to the UE duringthe WUS occasion based on the traffic load being below a firstthreshold; or code for causing the BS to determine to transmit the WUSto the UE during the WUS occasion based on the traffic load being abovea second threshold.